Bad news: Switching Claude and Dmitri in attempt to help Dmitri didn't seem to do either of them good. Claude also got restless and pale in the breeding trap. I cleaned out his 2.5 gal after Dmitri died, put in some fresh water & salt, and put him back in. He didn't seem to be doing well. Yesterday his fins were all shredded, I'm guessing he bit them? Today he's dead.
He was such a cute little guy with so much personality...

Good news though, my water seems to be fixed! Thursday I took out all the water in my 10 gal, cleaned everything well, and put in some salt & fresh water. I also moved some of the decor around a bit. My girls seem to be doing better! Aigis is active again, more vibrant too. So that's a relief. And Renard is doing well too, this morning I saw him exploring his little triceratops skull.